Calculating-machine.



y A. DJHAfRMoN.

CALCULATING MACHINE. @APPLICATION FII; EB NOV. 9. I9I4.

1,136,797.' Y Pwnted Apr, 2o, 1915.

6' 'f y' Z o .4( ol/ o Z y 4 @wozu/hoz y aat, l i l 1 To 'all whom mayconcern ALTON D. HARMON, 0F CilllfBlEl-I)GEy SPRINGS, PENNSYLVANIA.

ALCULATINQMAGHINE.

v specification of Letters Patent.

Application ledNovemberrS, 1914. Serial No. 871,125.

Be it known that I, AL'roN D.'V HARMON, a citizen `of the United States,residing at Cambridge Springs, in the` county of Crawford and State ofPennsylvania, vented certain new and useful Improvements inCalculating-Machines; and I do hereby declare the following to be afull, clear, and exactdescription of the invention, such as will enableothers skilled inthe art to'which it appertains to make and use thesame.

" soy This invention'relates to calculating machines, for adding andsubtractingnumerals, which are provided with tablets and slides;

andA it conslsts in the novel construction and ycombination of the partshereinafter fully described'and claimed. p

In the drawings, Figure l is a front view of a calculating machineconstructed according'to this invention. Fig. Q'is a cross sectionthrough the machine, taken on the line m-w in Fig. 1. F of the backplate ofthe machine. Fig. l is a front view of-one of the slides. Fig. 5is a Ilongitudinal section through the ma-L chine, taken ,on the liney--y in Fig. 1. Fig.

6 is a detail view of one of the carryingk signals.

The machine has a series of ribs b which project upwardly from it. Theseribs are arrangedl parallel to each other, and preferably atequaldistancesVY apart, and their. ends. b serve as stops" for the slides.

.The slides C haveslots c in their backs which slide over ltherlbs bwith very little* friction, and stops c are formed at the ends ofLtheslots for coming in contact withthe stops b ofthe ribs tto prevent*the slides v4from'being slid 'out of the frame and being lost.

vided, and six' similar slides are shown, an

are numbered from 1 to 6 consecutively from right to leftQY Each slidehas a rowof 18 stylus holes ,dA and d A ranged at equal distances 9holes d are blackened portion D of the slide to distinguish them fromlthe upper nine `holes al',

- but theV slide `may be' otherwisemarked mi any convenient manner todistinguish beA the two series'of'holes cZVand d.

tween The'holes d and yd are 'arranged on one 'have in-v 'g. 3`is adetail view" tablet or frame vvthe.` back plate B ofwhich is providedwith a Any' convenient number of slides (lis'pro-lA formed'in 1t andar-i apart. 'The ,lowerI formed 1n a" shaded'A or` Patented Apnao,1915.`

. side portion of the slide, and Aits other-side" i portion is providedwith a row- 'of index numerals E, from 0 to 9` inclusive. pTheselnumerals are arranged at'the same distances apart as the stylus holes,the numeral 2 be#v ing' arranged opposite the bottom stylus hole -of theseries d.

. is .the faceplate/ ofthe'tabletlor frame A, which is secured to theback plate B inany` approved way, and which extends over vall' theslides. In ,the device illustrated, theback plate has projecting pillarsf on its face, and theface vp late is secured to these pillars byscrewsfgfv- 'f The face plate has a series ofparallel slots g,corresponding to the slides 1'to6,

. and arranged so as to'A eXpose'. the stylus."`

holes inthe slides.y The ends g of the slots g form stops 'for thestylus or other .similarv instrument which yis inserted in the stylusAholes and is operated so as to movethe slides longitudinally.- The faceplate has afseries of sight holes tom ends of its slots, andr arrangedin line with the index numerals E ,on the slides.

rThese sight holes are positioned sothat, l 'when the cipher 0 onV each.slideis visible` through the sight [hole pertaining tothe` rslide,vtheAlowest stylus holeof the series d' is oppositefthefknumeral 1 ofaseriesof numerals l ymarked fon-,the face plate. Y Eachv slot has `aA seriesofnumerals each series are arranged at the `same. dis# tancesk apart asthe stylus holesi'nthe slidesand the index' numerals E.

h formed in it below `the bot? ,A

J, 1 tuainelusive, markedon it and the numerals of]` f The upper andlower ends)` of thelface plate i f have flangesc which project forwardlyand yform handleswhich are convenient in ,using vthe machine. ,Theffaceplate is formed' of thin resilientsheet "Ine-tal or other materialy,

holes `of the slides;

1. f which will spring a little, and indentations n are formed in it forengaging I.with the stylus Theseyindentations are.; preferably pressedin the sheet. metal plate.

at the upper ends lof* theslots, butfany other,l

approved ,means may be provided for checking the free movement oftheslides interf g mittently, and -obliging small 'amount of ,l force to be'usedfto manipulate thenisol05 that they vdo notv slide accident-allyAwhen the machine is tilted, lo'rrymoved about: ,These ections engage Iautomatically spring g proj jwith 'the stylus lioles.--"\ g A A).ICarrying signals arel provided, and asimif ric lar carryinglsignal issecure-d behind each The upper lever p has teethvlt and t which project.laterally from opposite sides of its top end. rI`-he -lower lever has atooth w which projectsfro-m the left hand side of its bottom end. Fig.l6 shows the signal its normal position, the tooth t projectingcrosswiseof the top of the righthand slot in the path of the stylus, andthe teeth t and w being concealed behind the'bar :of the face plate,which is shown in ldotted lines.

The end portion of the st lus is made of a suitable shape to operate t eteeth, aswell as to engage with the stylus holes. The teeth t and fw aresignal teeth, and when the stylus is moved to the top of the slot andoperates th'e tooth t', it turns the levers on their pivots .and exposesthe signal teeth t and 'w at l the top and bottom of the adjacent lefthand slot. -When the next slide to the left is moved to register thecarrying numerall, the stylus strikes the'tooth-w and restores 'thesignal to its normal position'.` v l The machine may be used-both foradding and for subtracting, and as -a sample of its- Ause for adding,suppose the numerals 7, 21, and 508 are to be added together. The slidesare first placed `in the zero position, as vshown,

in Fig. 11. The first numeral 7 is registered by inserting a stylus inthe stylus hole of slide N o. 1 which is'opposite the numeral 7 adjacentto said slide on the face plate, and moving the slide downwa-rdly'until.the stylus strikes the bottom end of the slot. .Thiswill cause thenumeral 7. on the slide tobe eX- `posed at the left hand sighthole.vWhen the stylus hole to.. be used is in the series'of stylus holes d andin the shaded or blackenedgporton of the slide, the .slide must alwaysbe moved downwardly; but when the appropriate stylus hole .is-.in theseries d vand inthe white portion of the slide, the

slide is moved upwardly. Each time a slide .is moved upwardly, lmust beadded by I. means of the next left hand slide.

. Thenumeral 21 is added byregisterngthe 2 with slide No. 2, and the 1with'slide- No. l, in a similar manner to the 7, so that 28 appearsatthesight holes.

The 508 is added by registering the 5 with the slide No. 3. `The cipher0 `does not re- 1 -quire to be registered, and the 8 is registered Aseries' of slides movable longitudinally in the frame and provided withstylus vholes lwith slide No. 1. As the appropriate stylus hole forregistering 8 isjin series d in the` White part of the slide, the slideis moved .stylus at the other end of .'lihpwardly until thestylus'strikes the tdi-)p lld' ofptheslot and operates the signal. Thenecessary 1 is added. by moving slide N o. 2 with the'stylus, the stylusbeing inserted in f the stylus hol'e opposite the numeral 1, and thevslide being moved downwardly, and thereby resetting the signal to itsnormal .poef 1 .sition. This will cause 586 to appear at the sightholes, which is the correct sum of the numerals 7 21, and 508.

Other numerals are added in `a similar` lmanner, and subtraction can bee'ected by operating'thev machine in .ausomewhat reversely similar way.vThe signals show automatically when carrying numbers are to to bemanipulated.

What I claim is:

be added, and valso indicate/the correct slide y 1. In a calculatingmachine, the combinai l i tion, with a frame provided with a back platehaving a seriesA of parallel projecting ribs, and a numbered 'face.plate provided with slots and` sight "hole=; of a series of 'yslidesprovided with slots theirbacks which engage with and slide uponthe 'said ribs, said slides being supported upon the said ribs out ofcontactwith the lsaid baek t also provided with indexnumeralsi arrangedbehind the bars of the face plate and in line with the sight holes. v

' 2. In a calculating machine, the combina--v vided with parallel slots,and slides. movable in the frame and provided with stylus holes; ofa'carrying signal pivoted under the face view at one end portionof oneslot when the the other end portion of the other slot. j 3. In acalculating machine, the combination, with aframe provided with a faceplate having parallel slots and'bars, .of a series ofl sli des movablelongitudinally in the frameA plate and with each other, said slidesbeing y tion, with a frame having a -face plate proios other projectionis moved by the stylus at e and provided with stylus holes arranged be-Y hind theslotsf and numerals arranged behind .the said bars, and signallevers arranged in pairs with, their adjacent ends articulated, saidsignal levers being pivoted behind the said bars and ,provided withteeth at their opposite end vportions adapted to project crosswise ofthe end' portions of the slots,

a signal-being displayed at one end of one slot eachy time a lever isoperated' by the the adjacent right hand slot.

` 4.-. a calculating machine, the combination, with a frame providedwith a face plate having parallel slots and bars, of a arranged behindthe slots and numerals 'arranged behind the eaid bars, signal leversarranged in pairs and .having their middle parts pivoted behind thesaidbars, the ad jacent ends of eachv pair of levers beingrartieulated to'ther,` and their opposite ends being vprovi ed with teeth adapted topro? ject crosswise'of the end portions of the slots, asignal being'displayed in one slot each time a lever is operated bythe stylus 1o -atone end of the adjacent right hand slot.l

In'testimony whereof I have aiixed my signature inY the .presence of twowitnesses. ALTON D. HARMON.

Witnesses: C; (Sr` FINNEY,

W. B. SHERMAN.

